Improvement in mechanical movements



JAMES lfI. MQCAMY, 0F VYTHEV ILLE, VIRGINIA.

IMPROVEMENT IN MECHANICAL MOVEMENTS.

Specilication forming part oil Letters Patent No. 116,617', dated July4, 1871.

To all whom it may concern:

Be it known that l, .Innes H. McUAnr, ofthe town of vl'f'ytheville andState oil Virginia, have invented certain ne and useful Improveincnts inMechanical M ovement, of which the following is a specification:

My invention relates to the combination of wheels and racks arrangedtogether on an axle, so that, by the reciprmbating action of the piston,they cause the axle to revolve, the object being to do this and topreserve at all times the line of traction direct with the center ofresistance; to have the power eontinuall y acting' at right angles witha line passin through theccnter ofthe axle, giving equal power and i'ullleverage to the pis ton, and thereby obtainin the whole mechanical forceof the steam 5 to do away altogether' with tl ie dead-points and enablethe machinery to start promptly from any position 5 to dispense with theseries of connecting-rods and other gearing' applicable to engines,simplifying and lessening their expenses, and to retain the power lostin the taugentialV action of the coimeeting-rod5 to place the cylinderin closer proximity to the axle, whereby the point of resistance isbrought closer to the power exerted, which will greatly shorten thelength of engines and lessen the danger of locomotives in passingcurves; and also to get the force exerted in the middle of the axle andrender it, if so desired to be, unnecessary to use more than a singleengine. )t-licrwise, one set ol" pinions, round.or oblong, and racks,&c., is put upon either end of the axle of the drivin g-wheels.

Figure l is a vertical longitudinal section. Fi 2 is a plan view ofthealleged invention.

The saine letters have reference to corresponding parts in each of theseiigures.

A A in Figs. l. and 2 are oblong pinions, revolved back and forth by thecurved racks B B, which are placed one above and the other below theaxle D 011 either side ofthe cam-wheel (l, the latter only of which isstationary to the axle. a, is the cylinder; b, the piston-rod, connectedto the crosshead c; d d, the driving-wheels on the track e c. Un theoblong pinions A A are selfactin cogs g g, one of which is seen in eachfigure. These are pressed down by metallic or Indiarubber springs l1 h,seen as before, which causes them, when they are raised over theinclined plane i 1'., Fig. 2, by the forward motion of A A by B B and b,to fall behind the shoulders j j. The racks B B being on each side oftheaxle D cause the wheels A A to pass in opposite directions, and,

from this circumstance, the seltacting cogs g q a forward motion, theother for reversing. Only one of those is seen in the engraving. Vhenone is in use the other is keyed up to miss their shoulders. To use morethan one set of drivingwheels, the length ofthe racks B B must beextended so as to reach over other sets of pinions, &c., arranged asbefore.

Iii' desired, the cam-wheels can be dispensed with by having projectionson the outside of pinions through. which the shaft passes. Mortises aremade through to the shaft for self-acting cogs to work in. Shouldersa-re arranged on shaft just as they are on cam-wheel, and substantiallyfor the same purpose. The racks are now placed on a line, one above theother.

I claim as my invention- 1. The oblong wheels A A, constructedsubstantially as and for the purpose hcreinbefore set forth.

2. The curved racks B B, in combination with oblong wheels A A,substantially as described.

3. The oblong pinions A A, t-he curved racks B B, with the cani-wheel C,arranged together substantially as and for the purpose hereinbefore setforth.

l/Vitnesscs ELIJAH DYER, Gnonen A. CATUN.

J. II. MCCAMY.

